QMA DPV11 Serial Synchronous Interface Technical Manual

This document is the Technical Manual for the QMA DPV11 Serial Synchronous Interface, published by Digital Equipment Corporation in January 1984. It describes a double-height module designed to connect an LSI-11 bus to a serial synchronous modem.

The QMA DPV11 operates as a double-buffered program interrupt interface, converting parallel data to serial for transmission and vice-versa for reception. It supports full-duplex or half-duplex operations at speeds up to 56K bits/s. It is compatible with EIA RS-232-C, RS-423-A, and RS-422-A electrical standards, and is intended for use with character-oriented (BISYNC, DDCMP) and bit-oriented (SDLC) data communication protocols.

The manual is a comprehensive guide for Field Service and Educational Service training personnel, covering:

• General description including features, specifications, and configurations.
• Installation procedures and preinstallation requirements, including jumper settings for various interface options.
• Register descriptions and programming information for its five 16-bit registers, detailing bit assignments and data transfer processes.
• Detailed technical description of its functional logic and components (like the USYNRT chip).
• Maintenance procedures, including recommended test equipment and diagnostic programs (e.g., CVDPV*).
• Appendices with diagnostic summaries, USYNRT chip details, options/cabinet kits, and programming examples.